Research question: How is microclimate impacted by ash (Fraxinus sp.) removal?

Hypothesis: Air temperature will increase at the location of the removed ash trees (#100e and 101w) due to increased solar radiation and decreasing shade and evapotranspiration.

Methods: Air temperature was measured in four locations along Boulder creek (Photo 1.) from September 17-24. Removal of the adjacent ash trees #100e and 101w occured on September 20th between 8am - 11am.

Photo 1. Aerial view of the study area, North of Boulder Creek, Boulder, Colorado.

Photo 1. Aerial view of the study area, North of Boulder Creek, Boulder, Colorado.

Figure 1. Histograms of the temperature value distributions from each sensor during each treatment phase

Figure 1. Histograms of the temperature value distributions from each sensor during each treatment phase

Figure 2. Time series plot showing control and treatment sensors over the study duration, Sept 17- Sept 24, 2018. Black vertical lines indicate time of tree removal, treatment tree sensors were not logging during this time removal time

Figure 2. Time series plot showing control and treatment sensors over the study duration, Sept 17- Sept 24, 2018. Black vertical lines indicate time of tree removal, treatment tree sensors were not logging during this time removal time

Time series plot showing control sensors over the study duration, Sept 17- Sept 24, 2018. Black vertical lines indicate time of tree removal, treatment tree sensors were not logging during this time removal time

Time series plot showing control sensors over the study duration, Sept 17- Sept 24, 2018. Black vertical lines indicate time of tree removal, treatment tree sensors were not logging during this time removal time

Figure 3. Time series plot showing individual treatment trees 100 and 101 over the study duration, Sept 17- Sept 24, 2018. Black vertical lines indicate time of tree removal, treatment tree sensors were not logging during this time removal time

Figure 3. Time series plot showing individual treatment trees 100 and 101 over the study duration, Sept 17- Sept 24, 2018. Black vertical lines indicate time of tree removal, treatment tree sensors were not logging during this time removal time

Figure 4. Time series plot showing individual treatment tree and control sensors over the study duration, Sept 17- Sept 24, 2018. Black vertical lines indicate time of tree removal, treatment tree sensors were not logging during this time removal time

Figure 4. Time series plot showing individual treatment tree and control sensors over the study duration, Sept 17- Sept 24, 2018. Black vertical lines indicate time of tree removal, treatment tree sensors were not logging during this time removal time

Figure 5. Time series plot of all 4 sensors over the study duration, Sept 17- Sept 24, 2018. Black vertical lines indicate time of tree removal, treatment tree sensors were not logging during this time removal time

Figure 5. Time series plot of all 4 sensors over the study duration, Sept 17- Sept 24, 2018. Black vertical lines indicate time of tree removal, treatment tree sensors were not logging during this time removal time